After a day of research with former C&NW bridge records, I found this bridge was not at this location in 1918. However, it was clearly brought in from another location. The attatched photo is a truss across the Zumbro River near Rochester, Minnesota. The spans at Rochester and here match lengths, and are identical trusses. The Rochester bridge was replaced between 1919 and 1920. Could these be the same spans?
Confirmed that this bridge was built in 1919, as it does not show up in the 1918 valuation records, but does show up on a 1919 map as the current configuration. I am currently looking for structural plans for this bridge, which I believe will confirm that this bridge is indeed from Rochester, Minnesota (see my previous comment).